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x in (-oo:+oo)
(-3/5)*x = 11 // - 11
(-3/5)*x-11 = 0
-3/5*x-11 = 0 // + 11
-3/5*x = 11 // : -3/5
x = 11/(-3/5)
x = -55/3
x = -55/3
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